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package javax.xml.bind.helpers;

import org.w3c.dom.Node;

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import java.net.URL;

/**
 * <p>
 * JAXB 1.0 only default validation event handler. This is the default
 * handler for all objects created from a JAXBContext that is managing
 * schema-derived code generated by a JAXB 1.0 binding compiler.
 *
 * <p>
 * This handler causes the unmarshal and validate operations to fail on the first
 * error or fatal error.
 *
 * <p>
 * This handler is not the default handler for JAXB mapped classes following
 * JAXB 2.0 or later versions. Default validation event handling has changed
 * and is specified in  {@link javax.xml.bind.Unmarshaller} and
 * {@link javax.xml.bind.Marshaller}.
 *
 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li></ul>
 * @see javax.xml.bind.Unmarshaller
 * @see javax.xml.bind.Validator
 * @see javax.xml.bind.ValidationEventHandler
 * @since JAXB1.0
 */
public class DefaultValidationEventHandler implements ValidationEventHandler {

    public boolean handleEvent(ValidationEvent event) {

        if (event == null) {
            throw new IllegalArgumentException();
        }

        // calculate the severity prefix and return value
        String severity = null;
        boolean retVal = false;
        switch (event.getSeverity()) {
            case ValidationEvent.WARNING:
                severity = Messages.format(Messages.WARNING);
                retVal = true; // continue after warnings
                break;
            case ValidationEvent.ERROR:
                severity = Messages.format(Messages.ERROR);
                retVal = false; // terminate after errors
                break;
            case ValidationEvent.FATAL_ERROR:
                severity = Messages.format(Messages.FATAL_ERROR);
                retVal = false; // terminate after fatal errors
                break;
            default:
                assert false : Messages.format(Messages.UNRECOGNIZED_SEVERITY, event.getSeverity());
        }

        // calculate the location message
        String location = getLocation(event);

        System.out.println(Messages.format(Messages.SEVERITY_MESSAGE, severity, event.getMessage(), location));

        // fail on the first error or fatal error
        return retVal;
    }

    /**
     * Calculate a location message for the event
     *
     */
    private String getLocation(ValidationEvent event) {
        StringBuffer msg = new StringBuffer();

        ValidationEventLocator locator = event.getLocator();

        if (locator != null) {

            URL url = locator.getURL();
            Object obj = locator.getObject();
            Node node = locator.getNode();
            int line = locator.getLineNumber();

            if (url != null || line != -1) {
                msg.append("line " + line);
                if (url != null)
                    msg.append(" of " + url);
            } else if (obj != null) {
                msg.append(" obj: " + obj.toString());
            } else if (node != null) {
                msg.append(" node: " + node.toString());
            }
        } else {
            msg.append(Messages.format(Messages.LOCATION_UNAVAILABLE));
        }

        return msg.toString();
    }
}
